Hydraulic Check Valves That Stop Backflow and Hold Loads
A hydraulic check valve lets oil flow freely in one direction and blocks reverse flow. That simple function protects pumps when a system stops, isolates accumulators, prevents loads from dropping and keeps circuits primed. Techknow Engineering Enterprise is a hydraulic check valve supplier and distributor for industrial and mobile equipment across India.
Our range includes direct-acting check valves with a ball or poppet seat, and the pilot operated check valve, which can be opened in reverse by a pilot signal to lower or release a load under control.
We are an Authorized HYDAC Distributor in India and also supply check valves from Rexroth, Parker, Bucher, Yuken, Eaton-Vickers, Sun, Beiri and Hawe in inline, sandwich plate, cartridge and manifold mounting designs.
Maintenance teams and OEM buyers in Mumbai, Pune, Gujarat, Chennai, Hyderabad, Delhi and across India use our support for valve selection, like-for-like replacements and seal kits that restore safe, leak-tight operation.
Types of Hydraulic Check Valves We Supply
Each hydraulic check valve type suits a different position in the circuit. Mounting, flow and whether reverse flow must be released on demand decide the right choice.
Inline Check Valves
Inline check valves with threaded ports fit directly in pipework or hose lines. A spring-loaded ball or poppet opens at the cracking pressure and seals against reverse flow.
Pilot Operated Check Valve
A pilot operated check valve holds a cylinder or load without leakage and opens in reverse only when pilot pressure is applied, giving controlled lowering on presses, lifts and cranes.
Sandwich Plate Check Valves
Sandwich plate check valves mount between a directional valve and its sub-plate. Pilot operated sandwich versions can lock one or both actuator ports.
Cartridge Check Valves
Screw-in cartridge check valves install in manifold blocks, keeping circuits compact and reducing external leak points.
Manifold Mounting Check Valves
Manifold and sub-plate mounted check valves suit power units and larger flows where valves are grouped on a common block.
Defined Cracking Pressure
The standard cracking pressure is 0.5 bar. A check valve with a stronger spring can create back pressure, for example to protect a filter or cooler bypass. Ask our team about the options for your valve.
Our Check Valve Range Includes
- Inline mounting check valves
- Sandwich plate design
- Cartridge mounting options
- Manifold mounting designs
- Pilot operated check valves
- Seal kits and spares for check valves
Key Benefits
- Prevents reverse flow and pump back-spin
- Holds loads leak-free with pilot operated designs
- Isolates accumulators and circuit branches
- Keeps lines primed and reduces contamination ingress
- Simple, robust design with long service life
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Authorized HYDAC Distributor and Multi-Brand Hydraulic Check Valve Supplier
Techknow Engineering is an Authorized Distributor for HYDAC in India, supplying genuine HYDAC check valves backed by OEM specifications and manufacturer support. Techknow is a multi-brand hydraulic check valve supplier that also distributes Rexroth, Parker, Bucher, Yuken, Eaton-Vickers, Sun, Beiri and Hawe valves, so every hydraulic check valve in your system can come from one reliable partner.
Hydraulic Check Valve Specifications
Typical ranges across our hydraulic check valve programme. Exact values depend on valve type, brand and size.
Operating Pressure
Maximum operating pressure of 350 bar for industrial power units, presses and mobile machinery.
Flow Rate
Maximum flow rate of 450 LPM, with sizes selected to keep pressure drop and heat low.
Valve Sizes
Nominal valve sizes from 06 to 32 to match existing pipework, sub-plates and manifolds.
Cracking Pressure
Standard cracking pressure of 0.5 bar, with ball or poppet seats for reliable, leak-tight closing.
Seal Material
Seals available in Perbunan (NBR) or Viton (FKM) to suit the fluid and operating temperature.
Mounting Options
Inline, sandwich plate, cartridge and manifold mounting for new circuits or direct replacement.
Selecting and Applying a Hydraulic Check Valve
Practical guidance for engineers and maintenance teams. Click each topic to expand.
Forward pressure acts on a ball or poppet held against its seat by a light spring. When this pressure exceeds the cracking pressure, the closing element lifts and oil flows. If flow tries to reverse, system pressure and the spring push the element back onto the seat, sealing the line.
Because a check valve seals on a seat rather than around a spool, it can block flow with very low leakage. This is why check valves are used wherever a load or an accumulator must be held for long periods.
A pilot operated check valve behaves like a normal check valve until pressure is applied to its pilot port. The pilot pressure acts on a piston that pushes the poppet open, allowing reverse flow so a cylinder can be lowered or retracted.
The pilot piston area is larger than the poppet seat area, so a relatively low pilot pressure can open the valve against a higher load pressure. Large cylinders under high pressure may need a decompression-type valve, which opens in stages to release trapped pressure gently and avoid shock.
For reliable load holding, the directional valve centre position should connect the pilot line and actuator ports to tank, so pilot pressure falls to zero and the check valve closes fully.
Use this checklist before you request a quote:
- Function: free flow and blocking only, or reverse release with a pilot signal
- Maximum operating pressure and flow rate
- Nominal size and mounting: inline, sandwich, cartridge or manifold
- Cracking pressure required
- For pilot operated types: load pressure, available pilot pressure and need for decompression
- Port threads, fluid type, temperature and seal material (NBR or FKM)
Check valves protect pump outlets, isolate hydraulic accumulators, provide bypass routes around oil coolers and oil filters, and hold loads on hydraulic cylinders.
If a held cylinder creeps, check for contamination or wear on the valve seat, internal leakage in the cylinder, and residual pilot pressure. Oil trapped between a closed check valve and a cylinder can rise in pressure as it warms, so a suitable pressure relief valve may be needed in the circuit.
Powering Industries Across India
Our check valve range is used in industries where reliable one-way flow and safe load holding are critical.
Rolling, Pressing & Casting
Turbine Control & Emergency Backup
Turbine Governing & Dam Gates
Pitch Control & Braking Systems
Excavators, Cranes & Earthmovers
Press Shop, Body Shop & Assembly
Steering & Deck Machinery
Pulp Processing & Paper Production
Crushers, Kilns & Material Handling
Injection & Blow Moulding
Pressure Stabilization & Shutdown
Valve Actuation & Pressure Control
Your Hydraulic System Deserves Better.
Right products, right brands, right expertise — hydraulic solutions that truly perform under pressure.
14+ Years of Experience
Over a decade of experience helping industries across India choose the right check valve for pumps, accumulators and load-holding circuits.
Premium Brand Portfolio
We are an Authorized HYDAC Distributor for HYDAC products and a trusted hydraulic check valve supplier and distributor for Rexroth, Parker, Bucher, Yuken, Eaton-Vickers, Sun, Beiri and Hawe.
Pan-India Delivery
Reliable delivery across Mumbai, Pune, Gujarat, Chennai, Hyderabad, Delhi and other industrial regions to keep downtime low.
Expert Technical Support
Advice on pilot operated check valve circuits, cracking pressure, sizing and cylinder drift problems.
Replacement Matching
Share the nameplate or model code of an existing valve and our team will check the same model or a suitable alternative.
Seal Kits & Spares
Seal kits and spare parts for quick repairs, reducing maintenance time and keeping circuits running.
What Our Clients Say
Trusted by engineers and procurement heads across India's leading industries
FAQ'S
A hydraulic check valve allows oil to flow freely in one direction and blocks it in the reverse direction. A spring-loaded ball or poppet lifts off its seat when forward pressure exceeds the cracking pressure and closes when flow tries to reverse.
A standard hydraulic check valve can only be opened by forward flow. A pilot operated check valve can also be opened in the reverse direction by applying pilot pressure to a separate port, which makes it ideal for holding a cylinder load without leakage and then releasing it under control.
Cracking pressure is the inlet pressure at which the check valve begins to open. Our standard check valves have a cracking pressure of 0.5 bar. A higher cracking pressure can be used to create a defined back pressure, for example in bypass lines.
Common causes are a directional valve centre position that keeps pilot pressure on the check valve, contamination or wear on the check valve seat, internal leakage in the cylinder seals, or thermal expansion of trapped oil. Our team can help you work through these checks.
Techknow is a hydraulic check valve supplier and an Authorized HYDAC Distributor in India for HYDAC products, and also supplies check valves from Rexroth, Parker, Bucher, Yuken, Eaton-Vickers, Sun, Beiri and Hawe.
Share the check valve type (direct or pilot operated), maximum operating pressure, flow rate, nominal size, mounting style (inline, sandwich, cartridge or manifold), port threads, cracking pressure and seal material. For replacements, the model code on the existing valve is the quickest reference.
Looking for a Hydraulic Check Valve Supplier?
As a hydraulic check valve supplier and multi-brand distributor, Techknow Engineering helps you choose a standard or pilot operated check valve for your circuit. Contact us and request a quote with your pressure, flow and mounting details.
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